FOREWORD [DYNAMIC STABILITY CONTROL (DSC)]
- Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To check the DTC, follow the DTC Inspection steps. (See «ON-BOARD DIAGNOSTIC [DYNAMIC STABILITY CONTROL (DSC)]»(ref-430293-S20178903832011101700000) )
PRECAUTION [DYNAMIC STABILITY CONTROL (DSC)]
- The ABS warning light and/or brake system warning light and/or DSC indicator light and/or DSC OFF light illuminate even when the system is normal. ABS WARNING AND BRAKE SYSTEM WARNING LIGHTS CONDITION REFERENCE Warning lights that may illuminate and/or flash Condition under which the light may illuminate Conditions under which the light will go out ABS, EBD, TCS and DSC control ABS warning light Brake system warning light DSC indicator light Under any of the following conditions: When the front wheels are jacked up, struck, or placed on a chassis roller, and only the front wheel ABS wheel speed sensors are spun for 20 s or more. After turning ignition switch off, vehicle is driven at speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. ABS: Disables control EBD: Disable control, in cases where the light may illuminate, only when DSC HU/CM detects that wheel speed sensors determine that two or more wheels are malfunctioning. Enables control, if wheel speed sensors determine three or more wheels are functioning correctly. TCS: Disables control DSC: Disables control Parking brake is not fully released while driving. Brake drag. Sudden acceleration/deceleration. Left/right or front/rear tires are different (size, radius, tire pressure, or wear is other than that listed on tire label). Battery voltage at DSC HU/CM ignition terminal drops below approx. 10 V. Battery voltage rises above approx. 10 V. ABS: Disables control EBD: Enables control TCS: Disables control DSC: Disables control Brake system warning light Brake fluid amount is low. Brake fluid level lower than recommended amount. ABS: Enables control EBD: Enables control TCS: Enables control DSC: Enables control
- Precautions during servicing of DSC The DSC is composed of electrical and mechanical parts. It is necessary to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting. Malfunction in electrical system The control module has an on-board diagnostic function. With this function, the ABS warning light and/or brake system warning light and/or DSC indicator light and/or DSC OFF light will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are in the control module. This function can find malfunctions that do not occur during periodic inspections. Connect the M-MDS to the DLC-2, the stored malfunctions will be displayed in the order of occurrence. To find out the causes of DSC malfunctions, use these onboard diagnostic results. If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of the wiring harness. The control module usually operates normally. Be careful when searching for the cause of malfunction. After repair, it is necessary to clear the DTC from the control module memory. Also, if the DSC related parts have been replaced, verify that no DTC is displayed after repairs. After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the control module, the ABS warning light may not go out even when the ignition switch is turned to the ON position. In this case, drive the vehicle at a speed of more than 10 km/h {6.2 mph} , make sure the ABS warning light goes out, and then clear the DTC. When repairing, if the DSC related connectors are disconnected and the ignition switch is turned to the ON position, the control module will mistakenly detect a fault and record it as a malfunction. CAUTION: In DSC vehicles, when the DSC HU/CM, steering angle sensor, or combined sensor is replaced, perform the initialization procedure for each sensor. (See «STEERING ANGLE SENSOR INITIALIZATION PROCEDURE»(ref-430291-S11560876092011101700000) ) (See «COMBINED SENSOR INITIALIZATION PROCEDURE»(ref-430291-S23574342772011101700000) ) To protect the control module, make sure the ignition is off before connecting or disconnecting the control module connector. Malfunctions in hydraulic system Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction. However, it is necessary to determine if the malfunction is in a DSC component or the conventional brake system. The DSC HU/CM contains delicate mechanical parts. If foreign material gets into the component, the DSC may fail to operate. Also, it will likely become extremely difficult to find the location of the malfunction in the event that the brakes operate but the DSC does not. Make sure foreign material does not enter when servicing the DSC (e.g. brake fluid replacement, pipe removal).
Malfunction data monitor method
- Perform the malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.
Scheme 66
- Inspect the connection condition of each female terminal.
- Insert the male terminal, and fit the female terminal side to female terminal. Inspect if the malfunction is in the female terminal.
NO. 1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]
| 1 | Any of the following lights do not illuminate when ignition switch turned to ON position: (ABS warning light, brake system warning light, DSC indicator light and/or DSC OFF light) |
|---|---|
| POSSIBLE CAUSE | DSC HU/CM DTC is stored Instrument cluster malfunction (power supply system, ground system) Poor connection at DSC HU/CM connector Poor connection at DSC HU/CM, instrument cluster or related parts connector terminals DSC HU/CM malfunction |
POSSIBLE CAUSE REFERENCE
NO. 2 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]
| 2 | Any of the following lights remain on: (ABS warning light, brake system warning light, DSC indicator light and/or DSC OFF light) |
|---|---|
| POSSIBLE CAUSE | Brake fluid amount is low Parking brake lever does not release DSC HU/CM DTC is stored Battery malfunction Charging system malfunction Poor connection at DSC HU/CM connector Poor connection at DSC HU/CM, instrument cluster or related parts connector terminals DSC HU/CM malfunction |
POSSIBLE CAUSE REFERENCE
NO. 3 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND DSC OFF LIGHT DO NOT ILLUMINATE [DYNAMIC STABILITY CONTROL (DSC)]
| 3 | There is a malfunction in the system even though ABS warning light, brake system warning light, DSC indicator light and DSC OFF light do not illuminate |
|---|---|
| POSSIBLE CAUSE | There is a mechanical malfunction in system DSC HU/CM DTC is stored DSC system malfunction Conventional brake system malfunction |
POSSIBLE CAUSE REFERENCE
NO. 4 ABS OR TCS*1 OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY *1: DSC SYSTEM FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING [DYNAMIC STABILITY CONTROL (DSC)]
| 4 | ABS or TCS *1 operates frequently/TCS does not work correctly *1 : DSC system function contains traction control function, DSC indicator light goes on and off while DSC is operating |
|---|---|
| POSSIBLE CAUSE | DSC HU/CM DTC is stored There is a malfunction in the engine control system (TCS malfunction) Tire size or tire pressure malfunction There is a difference in size or air pressure between the front and rear tires Incorrect ABS wheel-speed signal is input to DSC HU/CM |
POSSIBLE CAUSE REFERENCE
NO. 5 DSC*2 OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY *2: DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING [DYNAMIC STABILITY CONTROL (DSC)]
| 5 | DSC *2 operates frequently/ DSC does not work correctly *2 : DSC indicator light goes on and off while DSC is operating |
|---|---|
| POSSIBLE CAUSE | DSC HU/CM DTC is stored (input and output device malfunction) Poor installation of combined sensor and/or steering angle sensor (DSC operates intermittently) DSC HU/CM, combined sensor or steering angle sensor initialization is not performed after replacement (DSC does not work correctly) |
POSSIBLE CAUSE REFERENCE